OK, my copy from Target finally came in today but I haven't played any of the campaign because I'm still trying to beat the instructor's time in Gauntlet! AUUHHH, addicting, so close, had so many good runs and then I couldn't hit the enemy or I mistimed the wall jump and broke the flow. I'm making myself physically ill because I think my motion sickness kicked in lol.
OK, managed to play some campaign today and there's a lot of Metroid formula here. You know what you can be, how powerful you'll be but you'll have to work your way towards it. In this case it's salvaging power for your Titan. Later levels felt very Mirror's Edge with the wall running and navigation. There's a bit of Crysis feel to me as well with reliance on the pilot's cloaking ability. Lastly, yeah there's that Call of Duty gun play zen that still feels very punchy. It's a gorgeous game, pretty impressive with using the Source engine, if you think about it.